S7-300 Profbus Problem

alijuda · Apr 3, 2015

Dear Friends
I have S7-315 2DP profbus network and I have problem to start up this network because the main PlC couldnt communicate with all Nods I have 4 Node addressed with
ET200 S (IM151-1 Standard ) with address : 1
===========================================: 3
===========================================: 4
===========================================: 5
Only Nods : 1,4 working normally and the another nods not active
Please and advice for this problem
Best Wishes and many thanks for help
rregards
Ali

Thomas_v2 · Apr 3, 2015

I only see two configured slaves in your hardware configuration.
Slave with address 1 seems ok, slave with address 4 is not available or has an error.

You have to configure the other devices in your hardware configuration.

alijuda · Apr 3, 2015

Dear Thomas
Thanks for reply
Yes Your Point is correct , But I try with two nods only and also this not succssed
also I checked the HW config for Node -4- its correct
I dont know is the distance between nods can caused this problem
the distance around 300M and the network speed 1.5MB

Thomas_v2 · Apr 3, 2015

The Profibus manuals say, at 1500 kbit/s a maximum length of 200 meter, at 500 kbit/s a maximum length of 400 meter. I would go down to 500 kbit/s.

Important is the correct bus termination. Have you checked this?

In such cases I go around with my programming device, connect it to the profibus at the slaves that don't work, and check for reachable partners from the Simatic manager.

boneless · Apr 3, 2015

Looks like you have master address 1 and first slave address 1?

alijuda · Apr 3, 2015

realy good advice , I will checked
also is neccssary to aranged the nods serialy like 1,3,4,5 etc or I free to arranged it randm like 1,8,6 etc
Many Thanks for Help

boneless · Apr 3, 2015

You can do whatever you want with those, just keep within the range. Common practice is to use 1 for master.

alijuda · Apr 3, 2015

Dear Bonelss
I have the Master address for Main CPU S7-315 is( 2 )
But this project first project for me with Simens PLC network
Any Help will be highly Appreciate

Thomas_v2 · Apr 3, 2015

You can use addresses freely, but as boneless mentioned, I would not use address 1 for a slave (but I don't know if this is a problem).

I always start at address 5 for the DP-slaves. So I can use 1 for my programming device, 3 and 4 reserved for HMI devices.

boneless · Apr 3, 2015

my bad

.

you might want to post your project, makes it a lot easier to look at.
also, double triple check your termination and end switches.

Thomas_v2 · Apr 3, 2015

A good document about profibus is the Profibus Network System manual:

https://support.industry.siemens.com/cs/de/en/view/35222591

There you can find the table with the possible cable length.

alijuda · Apr 3, 2015

Thank you
I realy thanks all my friends for this Technical help

S7-300 Profbus Problem

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